Iangreyite
A valid IMA mineral species
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About Iangreyite
Ian E. Grey
Formula:
Ca2Al7(PO4)2(PO3OH)2(OH,F)15 ¡ 8H2O
Colour:
Colourless, white, cream, yellowish, light pink
Lustre:
Vitreous, Pearly
Hardness:
3
Specific Gravity:
2.46
Crystal System:
Trigonal
Name:
The mineral is named in honour of Dr Ian Edward Grey (b. 1944), formerly Chief Research Scientist at CSIRO Minerals, Melbourne, Australia, for his contributions to mineralogy, crystallography and the minerals-processing industry. Recently, Dr Greyâs expertise was key to solving a number of unique crystal-chemical problems related to alunite-supergroup members such as kolitschite, kintoreite and jarosite as well the structure of perhamite.
Visually similar to several alunite-type minerals (e.g., crandallite, plumbogummite), krĂĄsnoite and perhamite.
Unique Identifiers
Mindat ID:
39883
Long-form identifier:
mindat:1:1:39883:1
IMA Classification of Iangreyite
Approved
IMA Formula:
Ca2Al7(PO4)2(PO3OH)2(OH,F)15¡8H2O
Approval year:
2010
First published:
2011
Classification of Iangreyite
8.DE.45
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
E : With only medium-sized cations, (OH, etc.):RO4 = 3:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
E : With only medium-sized cations, (OH, etc.):RO4 = 3:1
42.13.19.
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Igy | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Iangreyite
Vitreous, Pearly
Transparency:
Transparent, Translucent
Colour:
Colourless, white, cream, yellowish, light pink
Hardness:
3 on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
On {001}
On {001}
Fracture:
Irregular/Uneven
Comment:
Somewhat flexible to brittle.
Density:
2.46(3) g/cm3 (Measured) 2.451 g/cm3 (Calculated)
Comment:
Calculated value based on the empirical formula.
Optical Data of Iangreyite
Type:
Uniaxial (+)
RI values:
nω = 1.544(2) nε = 1.554(2)
Max. Birefringence:
δ = 0.010
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 Âľm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 Âľm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic
Chemistry of Iangreyite
Mindat Formula:
Ca2Al7(PO4)2(PO3OH)2(OH,F)15 ¡ 8H2O
Element Weights:
Crystallography of Iangreyite
Crystal System:
Trigonal
Class (H-M):
32 - Trapezohedral
Space Group:
P321
Setting:
P321
Cell Parameters:
a = 6.988(1) Å, c = 16.707(3) Å
Ratio:
a:c = 1 : 2.391
Unit Cell V:
706.54 Ă
Âł (Calculated from Unit Cell)
Morphology:
Thin hexagonal tablets. The forms observed are {001} and {100}.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0018377 | Iangreyite | Mills S J, Kampf A R, Sejkora J, Adams P M, Birch W D, Plasil J (2011) Iangreyite: a new secondary phosphate mineral closely related to perhamite Mineralogical Magazine 75 327-336 | 2011 | Silver Coin mine, Nevada, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 16.739 Ă | (100) |
| 6.054 Ă | (18) |
| 5.687 Ă | (13) |
| 3.488 Ă | (9) |
| 2.967 Ă | (45) |
| 2.219 Ă | (19) |
| 1.896 Ă | (13) |
| 1.744 Ă | (17) |
Comments:
The powder diffraction pattern showed a close resemblance to that of perhamite.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47g : [Halogen-bearing surface weathering minerals] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Iangreyite
Co-Type Localities:
General Appearance of Type Material:
Thin, hexagonal tablets up to 0.4 mm in diameter and 0.02 mm thick (Silver Coin), and as coatings consisting of 0.3 mm wide clusters of minute and very thin intergrown tabular crystals with a maximum diameter of 0.2 mm (Krasno).
Place of Conservation of Type Material:
Mineral Sciences Department, Natural History Museum of Los Angeles County, California, USA (57661 and 62519).
Department of Mineralogy and Petrology, National Museum Prague, Czech Republic (P1P 20/2009).
Department of Mineralogy and Petrology, National Museum Prague, Czech Republic (P1P 20/2009).
Geological Setting of Type Material:
Weathering of Pb-Zn-Ag-containing veins in thin-bedded quartzite, argillite, and phosphatic argillite (Silver Coin). A Sn-deposit in autometamorphosed Li-mica-topaz granite with variable degrees of greisenization (Krasno). It appears to be a low-temperature alteration product of F-rich perhamite.
Associated Minerals at Type Locality:
Synonyms of Iangreyite
Other Language Names for Iangreyite
Dutch:Iangreyiet
German:Iangreyit
Relationship of Iangreyite to other Species
Structurally related to group(s):
Chemically related to group(s):
| Plumbogummite Group | A subgroup of the Alunite Supergroup. |
Common Associates
Associations Based on Photo Data:
| 1 photo of Iangreyite associated with Plumbogummite | PbAl3(PO4)(PO3OH)(OH)6 |
| 1 photo of Iangreyite associated with Bariopharmacosiderite | Ba0.5Fe3+4(AsO4)3(OH)4 ¡ 5H2O |
| 1 photo of Iangreyite associated with Hematite | Fe2O3 |
Related Minerals - Strunz-mindat Grouping
| 8.DE. | Arsenoveszelyite | Cu2Zn(AsO4)(OH)3 ¡ 2H2O |
| 8.DE. | Kipushite | (Cu,Zn)5Zn(PO4)2(OH)6 ¡ H2O |
| 8.DE. | Goldhillite | Cu5Zn(AsO4)2(OH)6 ¡ H2O |
| 8.DE.05 | Senegalite | Al2(PO4)(OH)(OH)2 ¡ H2O |
| 8.DE.10 | Fluellite | Al2(PO4)F2(OH) ¡ 7H2O |
| 8.DE.15 | Bulachite | Al6(AsO4)3(OH)9(H2O)4 ¡ 2H2O |
| 8.DE.20 | Zapatalite | Cu3Al4(PO4)3(OH)9 ¡ 4H2O |
| 8.DE.25 | Ceruleite | Cu2Al7(AsO4)4(OH)13 ¡ 11.5H2O |
| 8.DE.30 | Veszelyite | (Cu,Zn)2Zn(PO4)(OH)3 ¡ 2H2O |
| 8.DE.35 | Philipsburgite | Cu5Zn(AsO4)(PO4)(OH)6 ¡ H2O |
| 8.DE.40 | Juanitaite | (Cu,Ca,Fe)10Bi(AsO4)4(OH)11 ¡ 2H2O |
Fluorescence of Iangreyite
Not fluorescent.
Other Information
Notes:
Does not react with or dissolve in 1 M hydrochloric, nitric or 0.5 M sulphuric acid.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Iangreyite
mindat.org URL:
https://www.mindat.org/min-39883.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Iangreyite
Reference List:
Sejkora, J., Škoda, R., Ondruť, P. (2006) New naturally occurring mineral phases from the Kråsno - Hornà Slavkov area, western Bohemia, Czech Republic. Journal of the Czech Geological Society, 51 (1-2) 159-187
Mills, S. J., Kampf, A. R., Sejkora, J., Adams, P. M., Birch, W. D., PlĂĄĹĄil, J. (2011) Iangreyite: a new secondary phosphate mineral closely related to perhamite. Mineralogical Magazine, 75 (2) 327-336 doi:10.1180/minmag.2011.075.2.327
Keck, Erich, Grey, Ian E., MacRae, Colin M., Boer, Stephanie, Hochleitner, Rupert, Rewitzer, Christian, Mumme, William G., Glenn, A. Matt, Davidson, Cameron (2022) New secondary phosphate mineral occurrences and their crystal chemistry, at the Hagendorf SĂźd pegmatite, Bavaria. European Journal of Mineralogy, 34 (5) 439-450 doi:10.5194/ejm-34-439-2022
Localities for Iangreyite
Showing 8 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Czech Republic (TL) | |
| IMA Approvals - Feb. 2010 +1 other reference |
France | |
| Georges FAVREAU collection & EDX ... |
Germany | |
| Keck et al. (2022) |
Norway | |
| Larsen et al. (2013) +1 other reference |
Spain | |
| Calvo Rebollar et al. (2022) |
USA (TL) | |
| Mills et al. (2011) |
| Erik Vercammen collection |
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Utahlite claim, Utahlite Hill, Lucin, Box Elder County, Utah, USA